Tree exploration with logarithmic memory

Tree exploration with logarithmic memory
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使用对数内存进行树探索

DOI:
10.1145/1921659.1921663
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发表时间:
2011
影响因子:
1.3
通讯作者:
Ambühl C
Ambühl C
中科院分区:
计算机科学3区
文献类型:
--
作者:
Ambühl C

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我们认为网络探索的任务由一个移动的代理(机器人)与小内存。代理必须遍历网络的所有节点和边(表示为无向连通图),并返回到起始节点。网络的节点是未标记的,并且边缘端口在每个节点处被本地标记。代理没有网络拓扑或其大小的先验知识,并且不能以任何方式标记节点。在这种弱假设下,网络中的循环可能会阻止探索的可行性,因此我们将注意力限制在树上。我们提出了一个算法来完成树的探索(返回)usingO(logn)位内存的所有n节点的树。这加强了Diks等人的结果。[2004],其中O(log2n)位内存用于树探索,并匹配那里证明的内存大小下限。我们还将O(logn)位内存遍历机制扩展到一个较弱的模型,其中每个节点的端口以循环方式排序,但是,端口号的显式值不可用。
We consider the task of network exploration by a mobile agent (robot) with small memory. The agent has to traverse all nodes and edges of a network (represented as an undirected connected graph), and return to the starting node. Nodes of the network are unlabeled and edge ports are locally labeled at each node. The agent has no a priori knowledge of the topology of the network or of its size, and cannot mark nodes in any way. Under such weak assumptions, cycles in the network may prevent feasibility of exploration, hence we restrict attention to trees. We present an algorithm to accomplish tree exploration (with return) usingO(logn)-bit memory for alln-node trees. This strengthens the result from Diks et al. [2004], whereO(log2n)-bit memory was used for tree exploration, and matches the lower bound on memory size proved there. We also extend ourO(logn)-bit memory traversal mechanism to a weaker model in which ports at each node are ordered in circular manner, however, the explicit values of port numbers are not available.
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